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Old 06-19-2019, 09:26 AM   #13
cx
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Join Date: Jul 2001
Location: Boerne, Texas
Posts: 88,042
Quote:
Originally Posted by Randy
...a portion of one diagonal takes a dip of 1/16 1/8 between two boards that are flat.
'Fraid that doesn't compute for me.

You want to screw the 3/4" plywood at the same fastener schedule throughout. If you end up with an insufficiently flat floor, you'll need to deal with it at that level. I can envision a scenario where filling a minor depression with roofing felt or similar might be advisable prior to installing the plywood panels, but I'm not sure what you have there.

I'm one of the people Peter said would recommend pre-drilling that 3/4" plywood before installing. Maybe some folks can get by without doing so, but I have insufficient gravity to guarantee no screw-jacking with anything thicker than nominal half-inch material.

My opinion; worth price charged.
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